//去除浏览器默认样式
html, body, div, span, applet, object, iframe,
p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header,
menu, nav, output, ruby, section, summary,
time, mark, audio, video, input,button
{
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font-weight: normal;
}

article, aside, details, figcaption, figure,
footer, header, menu, nav, section
{
  display: block
}

a{
  text-decoration: none;
  color: #000;
}

ul,li{
  list-style: none
}

button{
  border: none;
  outline: none;
}
